I think, as a president, you have to want respect. You can't look for love from the American people. You have to just do what you think is right. Some people will hate you, but others, in the long run, will respect you for what you've done.

When you are an historian, there's probably nothing that matters more than to be recognized by your colleagues in your own profession. I was lucky enough to win the Pulitzer Prize for History. I had to give a talk right after that to some young people. The most important thing to tell them, I think, is that you can't ever know that it's going to turn out that way.

I think the most important advice is, a person doesn't have to find out right away. It's not like their first attempt at finding a profession is the only one they're going to find. I might well have gone down other paths, and it still might have been okay. But if you find something that you love, and if it keeps deepening with each new experience, then just stay with it.

Good leadership requires you to surround yourself with people of diverse perspectives who can disagree with you without fear of retaliation.

What interested me most about the Kennedys was the family situation. Somehow, they had created this family that lasted over time, they had a sense of connection to one another. Especially now, when people are spread all over the country and they don't see grandparents and parents, this family bonded together.

If you interview five people about the same incident, and you see five different points of view, it makes you know what makes history so complicated. Something doesn't just occur. It's not like a scientific event. It's a human event. So the dimensions of it will be seen differently by different people.

I think with Lyndon Johnson, the most important thing I learned was that he never had the sense of security that comes from inside. It always depended on other people making him feel good about himself, which meant that he was always beholden, continually needing to succeed. He could never stop. There was such a restlessness in him.